a. List all the things you WILL DO b. List all the thigns you WON'T DO
When you GET there your head will be a mess and you will be glad you planned ahead and put at least a rough list togehter...
My advice is to take a friend there with you... Keep your H on the defensive... As long as your friend is there he isn't gonig to initiate any conversations that turn into a fight... And that's very likley what he's gonna try to do if you let him